docs: dogfood coordinator mode workflow

[SetraTheXX]

Summary

Dogfoods Coordinator Mode v0.2 with a real 4-pane workflow.

What happened

• Manager created two docs-only tasks.
• Worker A updated README.md.
• Worker B updated docs/install.md.
• Reviewer checked diffs, reports, scope, forbidden files, and docs consistency.
• Reviewer decision: PASS.
• Manager finalized the run state under ignored .cewp/.

Changes

• Clarifies the Coordinator Mode pane workflow in README.md.
• Clarifies that Coordinator Mode creates per-run local runtime state in docs/install.md.

Learnings

• Coordinator Mode v0.2 works as a manual protocol.
• Separate worktrees prevented worker conflicts.
• Worker report/event model worked.
• Reviewer gate worked.
• The flow is still manual, so v0.3 should focus on worktree, collect, and finalize helpers before process automation.

Safety

• No CLI code changes.
• No skill changes.
• No package/version changes.
• No npm publish.
• .cewp/ runtime files remain ignored and are not part of this PR.

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